# score = int(input("请输入分数:"))
# if score >= 90:
#     print("优")
# elif 80 <= score < 90:
#     print("良")
# elif 70 <= score < 80:
#     print("中")
# elif 60 <= score < 70:
#     print("差")
# else:
#     print("不合格")




#定义分数
score = int(input("请输入你的分数："))
if score >= 90:
    print("优秀")
elif score >= 80:
    print("良好")
elif score >= 70:
    print("中等")
elif score >= 60:
    print("及格")
else:               # 该else表示：上述条件都不满足时执行else
    print("不及格")